A Method to Solve Discontinuity of Reverse Time Migration Waveform
A technology of reverse time migration and reverse time migration imaging, which is applied in the field of exploration and reservoir geophysics, and can solve the problems of reverse time migration waveform discontinuity, affecting seismic exploration effect, and increasing waveform discontinuity
Active Publication Date: 2016-06-08
BC P INC CHINA NAT PETROLEUM CORP +1
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Problems solved by technology
The reverse time migration imaging mechanism is different from conventional seismic migration. Its imaging waveform is discontinuous, and the waveform discontinuity increases with the increase of the spatial grid step size, even if the spatial grid is refined to a small (1m* 1m) can not solve the discontinuity problem of reverse time migration waveform, this problem directly affects the effect of seismic exploration
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[0023] The present invention will be described in detail below in conjunction with the accompanying drawings and implementation examples.
[0024] The present invention is realized through the following steps:
[0025] 1) Acquire seismic data and process to obtain the velocity model in the depth domain ( figure 1 (a), mainly composed of a set of monocline structures, a thrust fault and three scatter points) and forward modeling shot data ( figure 1 (b), for one of the shot earthquake records);
[0026] 2) Use the following formula to perform forward modeling of the single-shot wave equation in the depth domain:
[0027] 1 v 2 ∂ 2 P s ( X , t ) ∂ t ...
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The invention is a method for effectively solving the discontinuity of the reverse time migration waveform, which can improve the fine description of the oil reservoir. Using the layer velocity model in the depth domain and the forward modeling shot data, first select the source wavelet, carry out the single-shot wave equation forward modeling in the depth domain, and store the wave field of the single-shot source at all times; then use the single-shot seismic record as the initial boundary condition, from The wave equation forward modeling is performed reversely along the time axis at the maximum recording moment to obtain the receiving wave field. Using the smooth imaging condition proposed by the present invention, the single-shot reverse-time migration imaging after continuous waveforms is obtained, and all single-shot reverse-time migration imaging is carried out. Superimposed to obtain reverse time migration imaging. The smooth imaging condition of the present invention is better than the conventional imaging condition in terms of waveform continuity, seismic instantaneous frequency along the layer, and phase space variation stability.
Description
technical field [0001] The invention relates to exploration and oil reservoir geophysics technology, in particular to a method for solving the discontinuity of reverse time migration waveform. technical background [0002] In exploration and reservoir geophysics, seismic migration imaging is the most critical step. The quality of imaging directly affects the subsequent seismic and geological interpretation, thus affecting the identification of oil and gas reservoirs. Seismic migration imaging can be divided into several categories: (1) Kirchhoff integration migration based on ray theory; (2) F-K migration and finite difference migration based on one-way wave theory; (3) two-way wave theory-based migration reverse time migration. (1) and (2) belong to conventional seismic migration, and have limited imaging capabilities for complex geological structures such as sharp changes in lateral velocity and high and steep dips. Reverse time migration is based on the two-way wave the...
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IPC IPC(8): G01V1/28
Inventor 凌云杨仁虎郭向宇胡新会
Owner BC P INC CHINA NAT PETROLEUM CORP